After some testing was performed on an Arduino Uno ... bits are set on the individual digital lines connected to the printer’s parallel port. At this point, the strobe line is pulled low ...

they could generate a very high and potentially dangerous amount of current when connected in parallel. This circuit board, powered by a small ATtiny microcontroller, has four XT60 connectors for ...

In this circuit, the infrared emitter IRED1 is modulated by connecting its anode (A) to ~38kHz signal yielded by D9 of the Arduino Uno (TP1 ... is tied to the D13 signal output (in parallel with the ...